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<head>
  <title>Google Earth API Samples - Toggling Event Listeners</title>
  <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
  <!-- You should probably remove most of this extra cruft if you're copying
       this sample! -->
  <style type="text/css">@import "static/examples.css";</style>
  <style type="text/css">@import "static/prettify/prettify.css";</style>
  <script type="text/javascript" src="static/prettify/prettify.js"></script>
  
  <!-- Change the key below to your own Maps API key -->
  <script type="text/javascript" src="http://www.google.com/jsapi?hl=en&amp;key=ABQIAAAAwbkbZLyhsmTCWXbTcjbgbRSzHs7K5SvaUdm8ua-Xxy_-2dYwMxQMhnagaawTo7L1FE1-amhuQxIlXw"></script>
  <script type="text/javascript">
  /* <![CDATA[ */
  var ge;
  var placemark;
  
  google.load("earth", "1");

  function init() {
    google.earth.createInstance('map3d', initCB, failureCB);
  }
  
  function initCB(instance) {
    ge = instance;
    ge.getWindow().setVisibility(true);
    
    // add a navigation control
    ge.getNavigationControl().setVisibility(ge.VISIBILITY_AUTO);
    
    // add some layers
    ge.getLayerRoot().enableLayerById(ge.LAYER_BORDERS, true);
    ge.getLayerRoot().enableLayerById(ge.LAYER_ROADS, true);

    // create the placemark
    placemark = ge.createPlacemark('');
    
    var point = ge.createPoint('');
    point.setLatitude(37);
    point.setLongitude(-122);
    placemark.setGeometry(point);
    
    // add the placemark to the earth DOM
    ge.getFeatures().appendChild(placemark);
    
    // look at the placemark we created
    var la = ge.createLookAt('');
    la.set(37, -122,
      0, // altitude
      ge.ALTITUDE_RELATIVE_TO_GROUND,
      0, // heading
      0, // straight-down tilt
      5000 // range (inverse of zoom)
      );
    ge.getView().setAbstractView(la);
    
    document.getElementById('installed-plugin-version').innerHTML =
      ge.getPluginVersion().toString();
  }
  
  function failureCB(errorCode) {
  }
  
  // global state
  var eventListenerActive;
  
  function enableListener() {
    if (!eventListenerActive) {
      google.earth.addEventListener(placemark, 'click', myEventHandler);
      eventListenerActive = true;
    }
  }
  
  function disableListener() {
    if (eventListenerActive) {
      google.earth.removeEventListener(placemark, 'click', myEventHandler);
      eventListenerActive = false;
    }
  }
  
  function myEventHandler(event) {
    // wrap alerts in API callbacks and event handlers
    // in a setTimeout to prevent deadlock in some browsers
    setTimeout(function() {
      alert('You clicked the placemark!');
    }, 0);
  }
  
  /* ]]> */
  </script>
</head>
<body onload="if(window.prettyPrint)prettyPrint();init();">
  <h1>Google Earth API Samples - Toggling Event Listeners</h1>
  <dl>
            <dt>Last Modified:</dt><dd>06/08/2009</dd>
    <dt>Installed Plugin Version:</dt><dd id="installed-plugin-version">...</dd>
  </dl>
  <div style="clear: both;"></div>
  
  <div id="ui" style="position: relative;">
    <div id="map3d" style="border: 1px solid silver; width: 500px; height: 500px;"></div>

    <div id="extra-ui" style="position: absolute; left: 520px; top: 0;">
      <input type="button" onclick="enableListener()" value="Enable Click Listener"/><br/>
      <input type="button" onclick="disableListener()" value="Disable Click Listener"/><br/>
      
      <h2>Relevant Resources:</h2>
      <ul>
<li><a href="http://code.google.com/apis/earth/documentation/reference/google_earth_namespace.html">google.earth Namespace Reference</a></li>
<li><a href="http://code.google.com/apis/earth/documentation/reference/interface_kml_event.html">KmlEvent Reference</a></li>
<a id="playground-button" href="http://code.google.com/apis/ajax/playground/?exp=earth#toggling_event_listeners"><img src="static/playground-button.png"/></a>      </ul>
      <h2>Relevant Code Excerpt:</h2>      <pre class="prettyprint lang-js">// global state
var eventListenerActive;

function enableListener() {
  if (!eventListenerActive) {
    google.earth.addEventListener(placemark, 'click', myEventHandler);
    eventListenerActive = true;
  }
}

function disableListener() {
  if (eventListenerActive) {
    google.earth.removeEventListener(placemark, 'click', myEventHandler);
    eventListenerActive = false;
  }
}

function myEventHandler(event) {
  // wrap alerts in API callbacks and event handlers
  // in a setTimeout to prevent deadlock in some browsers
  setTimeout(function() {
    alert('You clicked the placemark!');
  }, 0);
}</pre>    </div>
  </div>
</body>
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